Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:6: error: ‘i’ was not declared in this scope user.cpp:6: error: ‘n’ was not declared in this scope user.cpp:7: error: ‘v’ was not declared in this scope user.cpp:8: error: expected ‘}’ at end of input user.cpp:4: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:5: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result